11391020 has 24 divisors (see below), whose sum is σ = 25329024. Its totient is φ = 4288256.

The previous prime is 11391019. The next prime is 11391031. The reversal of 11391020 is 2019311.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 11391020.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16412 + ... + 17091.

It is an arithmetic number, because the mean of its divisors is an integer number (1055376).

Almost surely, 2^11391020 is an apocalyptic number.

11391020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11391020 is an abundant number, since it is smaller than the sum of its proper divisors (13938004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11391020 is a wasteful number, since it uses less digits than its factorization.

11391020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33529 (or 33527 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 11391020 is about 3375.0585180112. The cubic root of 11391020 is about 225.0026007930.

The spelling of 11391020 in words is "eleven million, three hundred ninety-one thousand, twenty".